timescaledb_information.data_nodes

Get information on data nodes. This function is specific to running TimescaleDB in a multi-node setup.

Available Columns

NameTypeDescription
node_nameTEXTData node name.
ownerREGCLASSOid of the user, who added the data node.
optionsJSONBOptions used when creating the data node.

Sample Usage

Get metadata related to data nodes.

SELECT * FROM timescaledb_information.data_nodes;

 node_name    | owner      | options                        
--------------+------------+--------------------------------
 dn1         | postgres   | {host=localhost,port=15431,dbname=test}   
 dn2         | postgres   | {host=localhost,port=15432,dbname=test} 
(2 rows)

timescaledb_information.hypertables

Get metadata information about hypertables.

Available Columns

NameTypeDescription
hypertable_schemaTEXTSchema name of the hypertable
hypertable_nameTEXTTable name of the hypertable
ownerTEXTOwner of the hypertable
num_dimensionsSMALLINTNumber of dimensions
num_chunksBIGINTNumber of chunks
compression_enabledBOOLEANIs compression enabled on the hypertable?
is_distributedBOOLEANIs the hypertable distributed?
replication_factorSMALLINTReplication factor for a distributed hypertable
data_nodesARRAYNodes on which hypertable is distributed
tablespacesARRAYTablespaces attached to the hypertable

Sample Usage

Get information about a hypertable.

CREATE TABLE dist_table(time timestamptz, device int, temp float);
SELECT create_distributed_hypertable('dist_table', 'time', 'device', replication_factor => 2);

SELECT * FROM timescaledb_information.hypertables
  WHERE hypertable_name = 'dist_table';

-[ RECORD 1 ]-------+-----------
hypertable_schema   | public
hypertable_name     | dist_table
owner               | postgres 
num_dimensions      | 2
num_chunks          | 3
compression_enabled | f
is_distributed      | t
replication_factor  | 2
data_nodes          | {node_1, node_2}
tablespaces         |

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